Sigma knowledge engineering environment

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In the computer science fields of knowledge engineering and ontology, the Sigma knowledge engineering environment is an open source computer program for the development of formal ontologies. It is designed for use with the Suggested Upper Merged Ontology. It originally included only the Vampire theorem prover as its core deductive inference engine, but now allows use of many other provers that have participated in the TPTP/CADE competitions.


  • Sigma web site
  • Pease, Adam; Schulz, Stephan (2014). Demri, Stephane; Kapur, Deepak; Weidenbach, Christoph, eds. "Knowledge Engineering for Large Ontologies with Sigma KEE 3.0". Proc. of the 7th IJCAR, Vienna. LNAI 8562: 519–525.